The 1-3/4 inch hose utilizes a 1-1/2 inch NPSH brass coupling so it will connect with existing 1-1/2 inch hoses, vari-nozzles, fireplugs, wye-gate valves, and reducer couplings.
Arrows, X's, and pictographs fill the gestural arena, and Crews exploits the nature of signs more so with fireplugs, klaxon horns, and directional markers.